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Chin. Phys. B, 2020, Vol. 29(5): 054211    DOI: 10.1088/1674-1056/ab7ea0

Electromagnetically induced transparency and electromagnetically induced absorption in Y-type system

Kalan Mal1,2, Khairul Islam2, Suman Mondal2, Dipankar Bhattacharyya3, Amitava Bandyopadhyay2
1 Department of Physics, Suri Vidyasagar College, Suri, PIN 731101, West Bengal, India;
2 Departmet of Physics, Visva-Bharati, Santiniketan, PIN 731235, West Bengal, India;
3 Department of Physics, Santipur College, Santipur, PIN 741404, West Bengal, India
Abstract  The propagation of a probe field through a four-level Y-type atomic system is described in the presence of two additional coherent radiation fields, namely, the control field and the coupling field. An expression for the probe response is derived analytically from the optical Bloch equations under steady state condition to study the absorptive properties of the system under probe field propagation through an ensemble of stationary atoms as well as in a Doppler broadened atomic vapor medium. The most striking result is the conversion of electromagnetically induced transparency (EIT) into electromagnetically induced absorption (EIA) as we start switching from weak probe regime to strong probe regime. The dependence of this conversion on residual Doppler averaging due to wavelength mismatch is also shown by choosing the coupling transition as a Rydberg transition.
Keywords:  Y-type system      density matrix method      electromagnetically induced transparency (EIT)      electromagnetically induced absorption (EIA)  
Received:  19 February 2020      Revised:  03 March 2020      Accepted manuscript online: 
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  32.10.Fn (Fine and hyperfine structure)  
Corresponding Authors:  Amitava Bandyopadhyay     E-mail:

Cite this article: 

Kalan Mal, Khairul Islam, Suman Mondal, Dipankar Bhattacharyya, Amitava Bandyopadhyay Electromagnetically induced transparency and electromagnetically induced absorption in Y-type system 2020 Chin. Phys. B 29 054211

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